Official PIN tags provide an option to officially identify sows and boars to the premises they were kept immediately prior to entering harvest channels. As with the USDA back tag applied at markets, the PIN tag will be collected as the official form of identification to be associated with any blood or tissue samples collected for disease surveillance. Panel/button ear tags measure 1-1/2 in. x 2-1/8 in. Sold in packs of 25. Allow extra delivery time. Cannot be returned.